'FortiNAC Dissolvable Agent' can't be opened because Apple cannot check it

Error

While registering your Mac with the campus network (click here for details), the following error appears when you attempt to open the 'FortiNAC Dissolvable Agent' app:

'FortiNAC Dissolvable Agent' can't be opened because Apple cannot check it for malicious software.

Environment

Macintosh operating systems

Solution

Click OK to close the error message.
Hold down the left 'Ctrl' key on the keyboard and click on the 'FortiNAC Dissolvable Agent' app.
Click on 'Open' in the Window that appears. Then, complete the registration as normal.